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How TCP and UDP packets come to the world
(lemmy.one)
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this post was submitted on 21 Jul 2023
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What do you mean interception is at a different layer? You can capture at any layer as long as the payload isn't encrypted, and if it is, you still get layers 1 through 4 (Physical, Link, Network, and Transport).
UDP is a transport protocol. OSI layer 4. It sits atop the packet (network/L3) layer which is where IP dictates where a packet is going. A broadcast or multicast IP address would mean it can be observed by many machines, but unicast is still the most common, and is routed to just one machine.